alpm_list: abort on memory allocation failure

This makes it possible to detect a failure in several alpm_list
functions.  Previously these functions would continue after a failure,
returning partial results and potentially leaking memory.
Unfortunately, NULL is a valid return value for the affected functions
if the input list is empty, so they still do not have a dedicated error
value.  Callers can at least detect an error by checking if the input
list was empty.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>

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